supermenscher
Jul6-04, 07:12 PM
1. What is the frequency of the magnetic filed if it is know to be perpendicular to the electric field. The magnetic field is 0.00178T and the electric field is 8000V/m.
2. I just need the angle for this one. At a certain location, the Earth's magnetic field has a magnitude of 5.6E-5T and points in a direction that is 72 degrees below the horizontal. Find the magnitued of the magnetic flux through the top of a desk at this location that measures 110cmX73cm.
I know you used magnetic flux = BAcos theta....but what is the angle theta, I tried 72 degrees and 18 degrees, what angle do I use?
3. When the switch is closed in a RL circuit the current in the circuit increases from 0A to 0.22A in 0.15s. This current also has a resistance of 5.5 ohms. What is the inductance L, how long after the switch is closed does the current have a value of 0.41A, and what is the maximum current that flows in the cirucit.
I have tried this problem using every formula possible and still can't get it...can someone help me out, even to get me started? Thank you.
2. I just need the angle for this one. At a certain location, the Earth's magnetic field has a magnitude of 5.6E-5T and points in a direction that is 72 degrees below the horizontal. Find the magnitued of the magnetic flux through the top of a desk at this location that measures 110cmX73cm.
I know you used magnetic flux = BAcos theta....but what is the angle theta, I tried 72 degrees and 18 degrees, what angle do I use?
3. When the switch is closed in a RL circuit the current in the circuit increases from 0A to 0.22A in 0.15s. This current also has a resistance of 5.5 ohms. What is the inductance L, how long after the switch is closed does the current have a value of 0.41A, and what is the maximum current that flows in the cirucit.
I have tried this problem using every formula possible and still can't get it...can someone help me out, even to get me started? Thank you.